"Dahmer on Dahmer: A Serial Killer Speaks" offers a fresh look at the infamous serial killer’s life through the eyes of the woman who became his closest confidant. With new interviews from pivotal figures in the case, the series sheds light on the grisly and complicated investigation. Looking back on her first interview with Dahmer, Nancy highlights on-and-off-camera conversations detailing Dahmer’s disturbing crimes through his own words, giving insight into his dark, depraved manner and reasons for killing.